Color wheels are a visual means of understanding the relationships among colors—how they are created, how they relate to one another, and what might work well together for certain situations.

A color wheel has 12 sections, each one representing a color. There are three primary colors, three secondary colors, and six tertiary colors. Primary colors are red, blue, and yellow.

On the 12-step color wheel, select any three colors located 120 degrees from each other: one color for the background, and two for content and navigation. Source: tuts+.

These colors are close to each other on the color wheel — like blue green, green, and yellow green — and tend to create a more soothing color combo.